Fuel cell stack

Abstract

A fuel cell stack includes a stacked body, a first terminal plate, a first insulating plate, a first end plate, and a first insulating collar member. The first insulating collar member includes a first tubular portion and a first flange portion. The first tubular portion is provided in the first fluid manifold hole. The first flange portion is disposed at one end of the first tubular portion. Another end of the first tubular portion projects to an outside of the first fluid manifold hole and is in slidably contact with an inner circumferential surface of the first outer manifold member via an outer circumferential surface sealing member. The first flange portion is in contact with the first insulating plate via an end-face sealing member.

What is claimed is: 
     
       1. A fuel cell stack comprising:
 a stacked body including a plurality of fuel cells which are stacked in a stacking direction, each of the fuel cells comprising:
 an electrolyte-electrode assembly having a pair of electrodes and an electrolyte disposed between the pair of electrodes in the stacking direction; and 
 a pair of separators between which the electrolyte-electrode assembly is sandwiched in the stacking direction; 
 
 a first terminal plate provided at a first end of the stacked body in the stacking direction; 
 a first insulating plate provided at the first end of the stacked body in the stacking direction; 
 a first end plate provided at the first end of the stacked body in the stacking direction, the first end plate including a first fluid manifold hole; 
 a first outer manifold member fixed to the first end plate; 
 a first insulating collar member comprising:
 a first tubular portion through which one of a cooling medium and a reactant gas is to flow to the first outer manifold member in the stacking direction, the first tubular portion being provided in the first fluid manifold hole; and 
 a first flange portion disposed at one end of the first tubular portion, another end of the first tubular portion projecting to an outside of the first fluid manifold hole and being in slidable contact with an inner circumferential surface of the first outer manifold member via an outer circumferential surface sealing member, the first flange portion being in direct contact with the first insulating plate and is sealed thereto via an end-face sealing member; and 
 
 a first spacer member provided between the first end plate and the first insulating plate to adjust a thickness of the fuel cell stack in the stacking direction. 
 
     
     
       2. The fuel cell stack according to  claim 1 , further comprising:
 a second terminal plate provided at a second end of the stacked body in the stacking direction, the second end being opposite to the first end with respect to the stacked body in the stacking direction; 
 a second insulating plate provided at the second end of the stacked body in the stacking direction; and 
 a second end plate provided at the second end of the stacked body in the stacking direction. 
 
     
     
       3. The fuel cell stack according to  claim 2 , further comprising:
 a second spacer member provided between the second end plate and the second insulating plate to adjust a thickness of the fuel cell stack in the stacking direction. 
 
     
     
       4. The fuel cell stack according to  claim 2 , wherein the second end plate includes a second fluid manifold hole. 
     
     
       5. The fuel cell stack according to  claim 4 , further comprising:
 a second insulating collar member comprising:
 a second tubular portion through which one of a cooling medium and a reactant gas is to flow to a second outer manifold member in the stacking direction, the second tubular portion being provided in the second fluid manifold hole; and 
 a second flange portion disposed at one end of the second tubular portion, another end of the second tubular portion projecting to an outside of the second fluid manifold hole and being in slidably contact with an inner circumferential surface of the second outer manifold member via an outer circumferential surface sealing member, the second flange portion being in contact with the second insulating plate via an end-face sealing member.